单项选择题

The carriers’ participation in the system is determined by （）.

A．the US federal government
B．mobile phone users
C．the carriers themselves
D．the law of the United States

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单项选择题

The phrase split up in the second paragraph means （） .

A．break apart
B．cause to break
C．become pieces
D．go in different directions

单项选择题

So far as the broadcasting hours devoted to entertainment are concerned, （）.

A．the Japanese figure is the highest in the world
B．the U. S. figure is smaller than the U. K. figure
C．the U. K. figure is second to the Japanese figure
D．the Canadian figure is higher than that of any other country